src/libcaptive/sandbox/split.c

   1 /* $Id$
   2  * Connection of captive-vfs interface through CORBA/ORBit
   3  * Copyright (C) 2002 Jan Kratochvil <project-captive@jankratochvil.net>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; exactly version 2 of June 1991 is required
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17  */
  18
  19
  20 #include "config.h"
  21
  22 #include "split.h"      /* self */
  23 #include "sandbox.h"
  24 #include "server-GLogFunc.h"
  25 #include "captive/macros.h"
  26 #include <glib/gmacros.h>
  27 #include <stdlib.h>
  28 #include "captive/rtl-file.h"
  29 #include <unistd.h>
  30 #include <fcntl.h>
  31 #include <linc/linc.h>  /* for linc_main_get_loop() */
  32 #include "server-Directory.h"
  33 #include "server-Vfs.h"
  34 #include "../client/vfs.h"
  35 #include "parent-Vfs.h"
  36 #include <dirent.h>
  37 #include "server-CaptiveIOChannel.h"
  38 #include <errno.h>
  39 #include "../client/giochannel-blind.h" /* for captive_giochannel_blind_new() */
  40 #include <signal.h>
  41
  42
  43 /* CONFIG: */
  44
  45 #define HEARTBEAT_SOURCE_CHECK_EVENTS (G_IO_IN|G_IO_PRI)
  46 #define HEARTBEAT_SOURCE_CHECK_REVENTS (HEARTBEAT_SOURCE_CHECK_EVENTS|G_IO_ERR|G_IO_HUP|G_IO_NVAL)
  47
  48
  49 gboolean validate_CORBA_Environment(CORBA_Environment *evp)
  50 {
  51         if (evp->_major==CORBA_NO_EXCEPTION)
  52                 return TRUE;
  53
  54         g_error(_("CORBA Exception occured: id=\"%s\", value=%p"),
  55                         CORBA_exception_id(evp),CORBA_exception_value(evp));
  56         CORBA_exception_free(evp);
  57         return FALSE;
  58 }
  59
  60 CORBA_Environment captive_corba_ev;
  61 CORBA_ORB captive_corba_orb;
  62 PortableServer_POA captive_corba_poa;
  63
  64 static void corba_shutdown_atexit(void);
  65
  66 static gboolean corba_init(const char *pname,CORBA_Environment *evp,CORBA_ORB *orbp,PortableServer_POA *poap)
  67 {
  68 static gboolean done=FALSE;
  69 int orb_argc=1;
  70 gchar *orb_argv[]={
  71                 (gchar *)captive_strdup_alloca(pname),
  72                 NULL};
  73
  74         g_return_val_if_fail(evp!=NULL,FALSE);
  75         g_return_val_if_fail(orbp!=NULL,FALSE);
  76         g_return_val_if_fail(poap!=NULL,FALSE);
  77
  78         if (done)
  79                 return TRUE;    /* FIXME: '*poap' is left invalid! */
  80
  81         /* Init 'ev' */
  82         CORBA_exception_init(evp);
  83
  84         /* Init 'orb' */
  85         *orbp=CORBA_ORB_init(&orb_argc,orb_argv,"orbit-local-orb",evp);
  86         g_return_val_if_fail(*orbp!=CORBA_OBJECT_NIL,FALSE);
  87         g_return_val_if_fail(validate_CORBA_Environment(evp),FALSE);
  88
  89         /* Init 'poa' */
  90         *poap=(PortableServer_POA)CORBA_ORB_resolve_initial_references(*orbp,"RootPOA",evp);
  91         g_return_val_if_fail(validate_CORBA_Environment(evp),FALSE);
  92         {
  93 PortableServer_POAManager poa_mgr;
  94                 poa_mgr=PortableServer_POA__get_the_POAManager(*poap,evp);
  95                 g_return_val_if_fail(validate_CORBA_Environment(evp),FALSE);
  96                 PortableServer_POAManager_activate(poa_mgr,evp);
  97                 g_return_val_if_fail(validate_CORBA_Environment(evp),FALSE);
  98                 CORBA_Object_release((CORBA_Object)poa_mgr,evp);
  99                 g_return_val_if_fail(validate_CORBA_Environment(evp),FALSE);
 100                 }
 101
 102         g_atexit(corba_shutdown_atexit);
 103
 104         done=TRUE;
 105         return TRUE;
 106 }
 107
 108
 109 static CORBA_ORB heartbeat_source_callback_orb=CORBA_OBJECT_NIL;
 110
 111 gboolean corba_shutdown(CORBA_Environment *evp,CORBA_ORB *orbp,PortableServer_POA *poap)
 112 {
 113 PortableServer_POA poa;
 114 CORBA_ORB orb;
 115
 116         g_return_val_if_fail(evp!=NULL,FALSE);
 117         g_return_val_if_fail(orbp!=NULL,FALSE);
 118         g_return_val_if_fail(poap!=NULL,FALSE);
 119
 120         /* Shutdown 'poa' */
 121         poa=*poap;
 122         *poap=CORBA_OBJECT_NIL;
 123         CORBA_Object_release((CORBA_Object)poa,evp);
 124         g_return_val_if_fail(validate_CORBA_Environment(evp),FALSE);
 125
 126         /* Shutdown 'orb' */
 127         orb=*orbp;
 128         *orbp=CORBA_OBJECT_NIL;
 129         heartbeat_source_callback_orb=CORBA_OBJECT_NIL;
 130         CORBA_ORB_destroy(orb,evp);
 131         /* Do not: g_return_val_if_fail(validate_CORBA_Environment(evp),FALSE);
 132          * here as CORBA_ORB_destroy() sometimes reports:
 133          *      WARNING **: ORB: a total of X refs to X ORB objects were leaked
 134          */
 135         CORBA_exception_free(evp);
 136
 137         /* Shutdown 'ev' */
 138         CORBA_exception_free(evp);
 139
 140         return TRUE;
 141 }
 142
 143 static void sandbox_parent_own_orbit_dir_cleanup_atexit(void);
 144
 145 static void corba_shutdown_atexit(void)
 146 {
 147 gboolean errbool;
 148
 149         errbool=corba_shutdown(&captive_corba_ev,&captive_corba_orb,&captive_corba_poa);
 150         g_assert(errbool==TRUE);
 151
 152         /* Delete the CORBA ORB socket directory only after full CORBA ORB shutdown. */
 153         sandbox_parent_own_orbit_dir_cleanup_atexit();
 154 }
 155
 156
 157 static GSource *captive_corba_sandbox_child_heartbeat_gsource;
 158
 159 #if 0   /* Currently unused - see server-Vfs.c:impl_Captive_Vfs_shutdown() */
 160 void sandbox_child_prepare_shutdown(void)
 161 {
 162         /* Prevent during shutdown: Captive-WARNING **: CORBA Exception occured: id="IDL:omg.org/CORBA/COMM_FAILURE:1.0" */
 163         if (captive_corba_sandbox_child_heartbeat_gsource) {
 164                 g_source_destroy(captive_corba_sandbox_child_heartbeat_gsource);
 165                 g_source_unref(captive_corba_sandbox_child_heartbeat_gsource);
 166                 captive_corba_sandbox_child_heartbeat_gsource=NULL;
 167                 }
 168 }
 169 #endif
 170
 171
 172 void sandbox_child_shutdown(void)
 173 {
 174         /* Do not fail by passing logging messages to the master. */
 175         impl_Captive_Vfs_init_g_log_func_disable();
 176
 177         g_main_loop_quit(linc_main_get_loop());
 178 }
 179
 180
 181 static gboolean heartbeat_source_callback(gpointer data /* unused */)
 182 {
 183         g_return_val_if_fail(heartbeat_source_callback_orb!=CORBA_OBJECT_NIL,FALSE);    /* the source should be removed */
 184
 185         sandbox_child_shutdown();
 186
 187         return FALSE;   /* the source should be removed */
 188 }
 189
 190
 191 static gboolean heartbeat_source_prepare(GSource *source,gint *timeout)
 192 {
 193         *timeout=-1;
 194
 195         return FALSE;
 196 }
 197
 198 static GPollFD heartbeat_source_check_gpollfd;
 199
 200 static gboolean heartbeat_source_check(GSource *source)
 201 {
 202         return !!(heartbeat_source_check_gpollfd.revents & HEARTBEAT_SOURCE_CHECK_REVENTS);
 203 }
 204
 205 static gboolean heartbeat_source_dispatch(GSource *source,GSourceFunc callback,gpointer user_data)
 206 {
 207         g_assert(callback!=NULL);
 208         return (*callback)(user_data);
 209 }
 210
 211 static GSourceFuncs heartbeat_source_watch_funcs={
 212                 heartbeat_source_prepare,
 213                 heartbeat_source_check,
 214                 heartbeat_source_dispatch,
 215                 NULL,   /* finalize */
 216                 };
 217
 218 void captive_corba_sandbox_child(const gchar *chrooted_orbit_dir)
 219 {
 220 Captive_Vfs Vfs_object;
 221 impl_POA_Captive_Vfs *Vfs_servant;
 222 gboolean errbool;
 223 guint errguint;
 224 int errint;
 225
 226         /* attach heartbeat_source_callback() to watch for any abnormalities
 227          * on our open pipe 'parentheart_fds' and terminate the child if parent dies.
 228          */
 229         captive_corba_sandbox_child_heartbeat_gsource=g_source_new(&heartbeat_source_watch_funcs,sizeof(GSource));
 230         g_return_if_fail(captive_corba_sandbox_child_heartbeat_gsource!=NULL);
 231         g_source_set_callback(
 232                         captive_corba_sandbox_child_heartbeat_gsource,  /* source */
 233                         heartbeat_source_callback,      /* func */
 234                         NULL,   /* data */
 235                         NULL);  /* notify */
 236         heartbeat_source_check_gpollfd.fd=0 /* STDIN */;        /* parentheart_fd_read */
 237         heartbeat_source_check_gpollfd.events=HEARTBEAT_SOURCE_CHECK_EVENTS;
 238         heartbeat_source_check_gpollfd.revents=0;
 239         g_source_add_poll(captive_corba_sandbox_child_heartbeat_gsource,&heartbeat_source_check_gpollfd);
 240
 241         errbool=corba_init("captive-sandbox-child",&captive_corba_ev,&captive_corba_orb,&captive_corba_poa);
 242         g_return_if_fail(errbool==TRUE);
 243
 244         heartbeat_source_callback_orb=captive_corba_orb;
 245
 246         /* linc_main_get_loop() makes sense only after corba_init() -> CORBA_ORB_init() */
 247         errguint=g_source_attach(
 248                         captive_corba_sandbox_child_heartbeat_gsource,  /* source */
 249                         g_main_loop_get_context(linc_main_get_loop())); /* context; NULL means 'default context' */
 250         g_assert(errguint!=0);
 251
 252         /* Init 'Vfs_object' */
 253         Vfs_object=impl_Captive_Vfs__create(captive_corba_poa,&captive_corba_ev);
 254         g_assert(validate_CORBA_Environment(&captive_corba_ev));
 255
 256         /* Pass IOR to our parent.
 257          * It will also create the socket needed for 'chrooted_orbit_dir' below
 258          * by CORBA_ORB_object_to_string()->ORBit_marshal_object()->IOP_generate_profiles()->ORBit_ORB_start_servers...
 259          */
 260         {
 261 char *Vfs_IOR;
 262                 Vfs_IOR=CORBA_ORB_object_to_string(captive_corba_orb,Vfs_object,&captive_corba_ev);
 263                 g_assert(validate_CORBA_Environment(&captive_corba_ev));
 264                 g_assert(Vfs_IOR!=NULL);
 265                 errint=printf("ior=%s\n",Vfs_IOR);
 266                 g_assert(errint>=0);
 267                 CORBA_free(Vfs_IOR);
 268                 }
 269
 270         /* Default mode is 0700, permit parent non-"captive" users to access our IOR socket. */
 271         if (chrooted_orbit_dir) {
 272 DIR *dir;
 273 struct dirent *dirent;
 274 const gchar *socketname=NULL,*socketpathname;
 275
 276                 errint=chmod(chrooted_orbit_dir,0755);
 277                 g_assert(errint==0);
 278
 279                 dir=opendir(chrooted_orbit_dir);
 280                 g_assert(dir!=NULL);
 281                 while (errno=0,(dirent=readdir(dir))) {
 282                         if (!strcmp(dirent->d_name,".") || !strcmp(dirent->d_name,".."))
 283                                 continue;
 284                         g_assert(socketname==NULL);
 285                         socketname=captive_strdup_alloca(dirent->d_name);
 286                         }
 287                 g_assert(errno==0);
 288                 errint=closedir(dir);
 289                 g_assert(errint==0);
 290                 g_assert(socketname!=NULL);
 291
 292                 socketpathname=captive_printf_alloca("%s/%s",chrooted_orbit_dir,socketname);
 293                 errint=chmod(socketpathname,0666);
 294                 g_assert(errint==0);
 295
 296                 printf("socketname=%s\n",socketname);
 297                 }
 298
 299         /* Close the output to flush it to our spawning parent. */
 300         errint=fflush(stdout);
 301         g_assert(errint==0);
 302         errint=fclose(stdout);
 303         g_assert(errint==0);
 304
 305         /* CORBA_ORB_run() -> linc_main_loop_run() -> g_main_loop_run()
 306          * and therefore we should be safe with glib events handling.
 307          */
 308         CORBA_ORB_run(captive_corba_orb,&captive_corba_ev);
 309         g_assert(validate_CORBA_Environment(&captive_corba_ev));
 310
 311         /* Shutdown 'Vfs' servant */
 312         Vfs_servant=PortableServer_POA_reference_to_servant(captive_corba_poa,Vfs_object,&captive_corba_ev);
 313         g_assert(validate_CORBA_Environment(&captive_corba_ev));
 314         CORBA_Object_release(Vfs_object,&captive_corba_ev);
 315         g_assert(validate_CORBA_Environment(&captive_corba_ev));
 316         impl_Captive_Vfs__destroy(Vfs_servant,&captive_corba_ev);
 317         g_assert(validate_CORBA_Environment(&captive_corba_ev));
 318
 319         errbool=corba_shutdown(&captive_corba_ev,&captive_corba_orb,&captive_corba_poa);
 320         g_assert(errbool==TRUE);
 321
 322         _exit(EXIT_SUCCESS);
 323 }
 324
 325
 326 static void options_module_captive_to_options_module_corba
 327                 (Captive_CaptiveOptionsModule *dest_options_module_corba,const struct captive_options_module *src_options_module_captive)
 328 {
 329         g_return_if_fail(dest_options_module_corba!=NULL);
 330         g_return_if_fail(src_options_module_captive!=NULL);
 331
 332         g_return_if_fail(src_options_module_captive->type==CAPTIVE_OPTIONS_MODULE_TYPE_PE32);
 333
 334         dest_options_module_corba->pathname_utf8=g_strdup(src_options_module_captive->pathname_utf8);
 335         dest_options_module_corba->data._buffer=g_memdup(src_options_module_captive->u.pe32.base,
 336                         src_options_module_captive->u.pe32.length);
 337         dest_options_module_corba->data._maximum=src_options_module_captive->u.pe32.length;
 338         dest_options_module_corba->data._length =src_options_module_captive->u.pe32.length;
 339         dest_options_module_corba->data._release=TRUE;
 340 }
 341
 342 static void unlink_nonrecursive(const gchar *dirname)
 343 {
 344 DIR *dir;
 345 struct dirent *dirent;
 346 int errint;
 347
 348         dir=opendir(dirname);
 349         g_assert(dir!=NULL);
 350
 351         while (errno=0,(dirent=readdir(dir))) {
 352 gchar *pathname;
 353
 354                 if (!strcmp(dirent->d_name,".") || !strcmp(dirent->d_name,".."))
 355                         continue;
 356                 pathname=g_strdup_printf("%s/%s",dirname,dirent->d_name);
 357                 errint=unlink(pathname);
 358                 g_assert(errint==0);
 359                 g_free(pathname);
 360                 }
 361         g_assert(errno==0);
 362         errint=closedir(dir);
 363         g_assert(errint==0);
 364         errint=rmdir(dirname);
 365         g_assert(errint==0);
 366 }
 367
 368 static const gchar *sandbox_parent_own_orbit_dir;
 369 static const gchar *sandbox_parent_own_orbit_socket;
 370
 371 static void sandbox_parent_own_orbit_dir_cleanup_atexit(void)
 372 {
 373 static gboolean done=FALSE;
 374
 375         g_log(G_LOG_DOMAIN,G_LOG_LEVEL_DEBUG,"%s; done=%d",G_STRLOC,(int)done);
 376
 377         if (done)
 378                 return;
 379         done=TRUE;
 380
 381         if (sandbox_parent_own_orbit_dir)
 382                 unlink_nonrecursive(sandbox_parent_own_orbit_dir);
 383 }
 384
 385 static struct sandbox_parent_own_orbit_dir_cleanup_signal {
 386         int signum;
 387         /* FIXME: Why we cannot use 'sighandler_t'? */ void (*sighandler_orig)(int signum);
 388         } sandbox_parent_own_orbit_dir_cleanup_signals[]={
 389                 { SIGINT  },
 390                 { SIGQUIT },
 391                 { SIGTERM },
 392                 { SIGHUP  },
 393                 { SIGABRT },
 394                 { SIGFPE  },
 395                 };
 396
 397 static void sandbox_parent_own_orbit_dir_cleanup_sighandler(int signum)
 398 {
 399 struct sandbox_parent_own_orbit_dir_cleanup_signal *sigstructp;
 400
 401         for (
 402                         sigstructp=sandbox_parent_own_orbit_dir_cleanup_signals;
 403                         sigstructp<sandbox_parent_own_orbit_dir_cleanup_signals+G_N_ELEMENTS(sandbox_parent_own_orbit_dir_cleanup_signals);
 404                         sigstructp++) {
 405                 if (sigstructp->signum==signum)
 406                         break;
 407                 }
 408         g_assert(sigstructp<sandbox_parent_own_orbit_dir_cleanup_signals+G_N_ELEMENTS(sandbox_parent_own_orbit_dir_cleanup_signals));
 409         signal(signum,sigstructp->sighandler_orig);
 410
 411         /* Prevent recursive fatal logging before signal restore: */
 412         /* Do not: g_log(G_LOG_DOMAIN,G_LOG_LEVEL_DEBUG,"%s: signum=%d,sighandler_orig=%p",G_STRLOC,signum,sigstructp->sighandler_orig);
 413          * as it is dangerous to g_log() from sighandler.
 414          */
 415
 416         sandbox_parent_own_orbit_dir_cleanup_atexit();
 417
 418         /* Do not: g_log(G_LOG_DOMAIN,G_LOG_LEVEL_DEBUG,"%s: re-raising...",G_STRLOC);
 419          * as it is dangerous to g_log() from sighandler.
 420          */
 421         raise(signum);
 422 }
 423
 424 static void sandbox_parent_own_orbit_dir_cleanup_init(void)
 425 {
 426 struct sandbox_parent_own_orbit_dir_cleanup_signal *sigstructp;
 427
 428         for (
 429                         sigstructp=sandbox_parent_own_orbit_dir_cleanup_signals;
 430                         sigstructp<sandbox_parent_own_orbit_dir_cleanup_signals+G_N_ELEMENTS(sandbox_parent_own_orbit_dir_cleanup_signals);
 431                         sigstructp++) {
 432                 sigstructp->sighandler_orig=signal(sigstructp->signum,sandbox_parent_own_orbit_dir_cleanup_sighandler);
 433                 if (sigstructp->sighandler_orig==SIG_IGN)
 434                         sigstructp->sighandler_orig=SIG_DFL;
 435                 }
 436 }
 437
 438 static gchar *sandbox_parent_read_ior
 439                 (int Vfs_IOR_fd_read,gchar **child_chroot_pid_hashkey_dirp,CaptiveVfsParentObject *captive_vfs_parent_object)
 440 {
 441 gchar *data;
 442 gsize data_size;
 443 GHashTable *hash;
 444 gchar *ior,*child_chroot_pid_hashkey_dir;
 445 int errint;
 446 gchar *s,*sd,*se;
 447 gboolean errbool;
 448
 449         /* Initialize /tmp/orbit-$username directory for linking IOR socket. */
 450         errbool=corba_init("captive-sandbox-parent",&captive_corba_ev,&captive_corba_orb,&captive_corba_poa);
 451         g_assert(errbool==TRUE);
 452
 453         /* FIXME: Security: Duplicate giop_tmpdir_init() here. */
 454         if (!sandbox_parent_own_orbit_dir) {
 455                 /* FIXME: Make 'CAPTIVE_SANDBOX_CHROOT' configurable. */
 456                 sandbox_parent_own_orbit_dir=g_strdup_printf("%s/tmp/captive-orbit-%d",CAPTIVE_SANDBOX_CHROOT,getpid());
 457                 if (mkdir(sandbox_parent_own_orbit_dir,0700)) {
 458                         g_assert(errno==EEXIST);
 459                         sandbox_parent_own_orbit_dir_cleanup_init();
 460                         unlink_nonrecursive(sandbox_parent_own_orbit_dir);
 461                         if (mkdir(sandbox_parent_own_orbit_dir,0700))
 462                                 g_assert_not_reached();
 463                         }
 464                 sandbox_parent_own_orbit_dir_cleanup_init();
 465                 linc_set_tmpdir(sandbox_parent_own_orbit_dir);
 466                 }
 467
 468         data=captive_rtl_file_read(Vfs_IOR_fd_read,&data_size); /* data_fd_read */
 469         errint=close(Vfs_IOR_fd_read);
 470         g_assert(errint==0);
 471         g_assert(data!=NULL);
 472         g_assert(data_size>=1);
 473         g_assert(data[data_size-1]=='\n');
 474
 475         hash=g_hash_table_new(g_str_hash,g_str_equal);
 476
 477         for (s=data;s<data+data_size;s=se+1) {
 478                 se=strchr(s,'\n');
 479                 g_assert(se!=NULL);
 480                 *se=0;
 481                 sd=strchr(s,'=');
 482                 g_assert(sd!=NULL);
 483                 *sd=0;
 484                 g_hash_table_insert(hash,s,sd+1);
 485                 }
 486         g_assert(s==data+data_size);
 487
 488         if ((child_chroot_pid_hashkey_dir=g_hash_table_lookup(hash,"chroot_pid_hashkey_dir"))) {
 489 const gchar *socketname,*socketpathname_src,*socketpathname_dest;
 490 const gchar *chrooted_orbit_dir;
 491
 492                 /* IOR contains the full pathname with the setuid username encoded. */
 493                 chrooted_orbit_dir=g_hash_table_lookup(hash,"chrooted_orbit_dir");
 494                 g_assert(chrooted_orbit_dir!=NULL);
 495                 captive_vfs_parent_object->corba_chrooted_orbit_dir=g_strdup(chrooted_orbit_dir);
 496                 /* 0700 as this directory will not be reused
 497                  * to commuicate with any other sandbox child.
 498                  */
 499                 if (mkdir(chrooted_orbit_dir,0700)) {
 500                         g_assert(errno==EEXIST);
 501                         }
 502
 503                 socketname=g_hash_table_lookup(hash,"socketname");
 504                 g_assert(socketname!=NULL);
 505                 captive_vfs_parent_object->corba_socketname=g_strdup(socketname);
 506
 507                 socketpathname_src=captive_printf_alloca("%s/%s/%s",child_chroot_pid_hashkey_dir,chrooted_orbit_dir,socketname);
 508                 socketpathname_dest=g_strdup_printf("%s/%s",chrooted_orbit_dir,socketname);
 509                 errint=link(socketpathname_src,socketpathname_dest);
 510                 if (errint)
 511                         g_error("link(\"%s\",\"%s\")=%d:%m",socketpathname_src,socketpathname_dest,errint);
 512                 }
 513         if (child_chroot_pid_hashkey_dirp)
 514                 *child_chroot_pid_hashkey_dirp=g_strdup(child_chroot_pid_hashkey_dir);
 515
 516         ior=g_hash_table_lookup(hash,"ior");
 517         g_assert(ior!=NULL);
 518         ior=g_strdup(ior);
 519         g_free(data);
 520
 521         g_hash_table_destroy(hash);
 522
 523         return ior;
 524 }
 525
 526
 527 static xmlNode *options_module_captive_to_xml
 528                 (xmlNode *dest_xml_parent,const struct captive_options_module *src_options_module_captive)
 529 {
 530         g_return_val_if_fail(dest_xml_parent!=NULL,NULL);
 531         g_return_val_if_fail(src_options_module_captive!=NULL,NULL);
 532
 533         { xmlNode *module=xmlNewTextChild(dest_xml_parent,NULL,"module",NULL);
 534         const gchar *type_string="???"; /* Prevent: ... might be used uninitialized in this function */
 535         const gchar *basename,*cgs;
 536
 537                 basename=src_options_module_captive->pathname_utf8;
 538                 if ((cgs=strrchr(basename,'/')))
 539                         basename=cgs+1;
 540                 xmlNewProp(module,"basename",basename);
 541                 switch (src_options_module_captive->type) {
 542                         case CAPTIVE_OPTIONS_MODULE_TYPE_PE32:
 543                                 type_string="PE32";
 544                                 xmlNewProp(module,"length",captive_printf_alloca("%lu",(unsigned long)src_options_module_captive->u.pe32.length));
 545                                 xmlNewProp(module,"md5"   ,src_options_module_captive->u.pe32.md5);
 546                                 break;
 547                         case CAPTIVE_OPTIONS_MODULE_TYPE_GMODULE:
 548                                 type_string="gmodule";
 549                                 break;
 550                         default: g_assert_not_reached();
 551                         }
 552                 xmlNewProp(module,"type",type_string);  /* AFTER the 'switch' to set 'type_string'! */
 553                 return module;
 554                 }
 555 }
 556
 557
 558 static void sandbox_parent_bug_doc_make(CaptiveVfsParentObject *captive_vfs_parent_object)
 559 {
 560         { xmlDoc *doc=xmlNewDoc("1.0");
 561                 captive_vfs_parent_object->corba_bug_doc=doc;
 562                 { xmlNode *bug=xmlNewDocNode(captive_vfs_parent_object->corba_bug_doc,NULL,"bug",NULL);
 563                         xmlDocSetRootElement(captive_vfs_parent_object->corba_bug_doc,bug);
 564                         captive_vfs_parent_object->corba_bug=bug;
 565                         { xmlNode *bug_captive=xmlNewTextChild(bug,NULL,"captive",NULL);
 566                                 xmlNewProp(bug_captive,"version",VERSION);
 567                                 }
 568                         { xmlNode *bug_filesystem=xmlNewTextChild(bug,NULL,"filesystem",NULL);
 569                                 options_module_captive_to_xml(bug_filesystem,&CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.filesystem);
 570                                 }
 571                         { xmlNode *bug_load_module=xmlNewTextChild(bug,NULL,"load_module",NULL);
 572                         guint load_moduleui;
 573                         struct captive_options_module *options_module;
 574                         GList *load_module_node;
 575
 576                                 for (load_moduleui=0,load_module_node=CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.load_module;
 577                                                 load_module_node;
 578                                                 load_moduleui++,load_module_node=load_module_node->next) {
 579                                         options_module=load_module_node->data;
 580                                         options_module_captive_to_xml(bug_load_module,options_module);
 581                                         }
 582                                 }
 583                         { xmlNode *bug_action=xmlNewTextChild(bug,NULL,"action",NULL);
 584                                 captive_vfs_parent_object->corba_bug_action=bug_action;
 585                                 }
 586                         { xmlNode *bug_log=xmlNewTextChild(bug,NULL,"log",NULL);
 587                                 captive_vfs_parent_object->corba_bug_log=bug_log;
 588                                 }
 589                         }
 590                 }
 591 }
 592
 593
 594 static void sandbox_parent(const gchar *Vfs_IOR,const gchar *child_chroot_pid_hashkey_dir,CaptiveVfsParentObject *captive_vfs_parent_object)
 595 {
 596 Captive_Vfs Vfs_object;
 597 Captive_GLogFunc GLogFunc_object;
 598 Captive_CaptiveIOChannel CaptiveIOChannel_object;
 599 Captive_CaptiveOptions options_corba;
 600 guint load_module_length,load_moduleui;
 601 struct captive_options_module *options_module;
 602 GList *load_module_node;
 603 const gchar *child_chroot_parent_own_orbit_socket,*child_chroot_parent_own_orbit_dir;
 604 int errint;
 605
 606         g_return_if_fail(Vfs_IOR!=NULL);
 607         /* 'child_chroot_pid_hashkey_dir' may be NULL */
 608         g_return_if_fail(CAPTIVE_VFS_PARENT_IS_OBJECT(captive_vfs_parent_object));
 609
 610         Vfs_object=CORBA_ORB_string_to_object(captive_corba_orb,Vfs_IOR,&captive_corba_ev);
 611         g_assert(validate_CORBA_Environment(&captive_corba_ev));
 612
 613         /* Init 'GLogFunc_object' */
 614         GLogFunc_object=impl_Captive_GLogFunc__create(captive_corba_poa,captive_vfs_parent_object,&captive_corba_ev);
 615         g_assert(validate_CORBA_Environment(&captive_corba_ev));
 616
 617         /* Init 'CaptiveIOChannel_object' */
 618         if (!captive_vfs_parent_object->corba_parent_giochanel_blind_source)
 619                 switch (CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.rwmode) {
 620                         case CAPTIVE_OPTION_RWMODE_RO:
 621                         case CAPTIVE_OPTION_RWMODE_RW:
 622                                 captive_vfs_parent_object->corba_parent_giochanel_blind_source=CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.image_iochannel;
 623                                 break;
 624                         case CAPTIVE_OPTION_RWMODE_BLIND:
 625                                 captive_vfs_parent_object->corba_parent_giochanel_blind_source=(GIOChannel *)captive_giochannel_blind_new(
 626                                                 CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.image_iochannel, /* giochannel_orig */
 627                                                 TRUE); /* writeable */
 628                                 break;
 629                         default: g_assert_not_reached();
 630                         }
 631         if (!captive_vfs_parent_object->corba_parent_giochanel_blind)
 632                 captive_vfs_parent_object->corba_parent_giochanel_blind=(GIOChannel *)captive_giochannel_blind_new(
 633                                 captive_vfs_parent_object->corba_parent_giochanel_blind_source,  /* giochannel_orig */
 634                                 (CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.rwmode!=CAPTIVE_OPTION_RWMODE_RO)); /* writeable */
 635         CaptiveIOChannel_object=impl_Captive_CaptiveIOChannel__create(captive_corba_poa,
 636                         captive_vfs_parent_object->corba_parent_giochanel_blind,&captive_corba_ev);
 637         g_assert(validate_CORBA_Environment(&captive_corba_ev));
 638
 639         /* Create the socket needed for 'sandbox_parent_own_orbit_socket' below
 640          * by CORBA_ORB_object_to_string()->ORBit_marshal_object()->IOP_generate_profiles()->ORBit_ORB_start_servers...
 641          */
 642         {
 643 char *GLogFunc_IOR;
 644                 GLogFunc_IOR=CORBA_ORB_object_to_string(captive_corba_orb,GLogFunc_object,&captive_corba_ev);
 645                 g_assert(validate_CORBA_Environment(&captive_corba_ev));
 646                 g_assert(GLogFunc_IOR!=NULL);
 647                 CORBA_free(GLogFunc_IOR);
 648                 }
 649
 650         if (sandbox_parent_own_orbit_dir && !sandbox_parent_own_orbit_socket) {
 651 DIR *dir;
 652 struct dirent *dirent;
 653
 654                 dir=opendir(sandbox_parent_own_orbit_dir);
 655                 g_assert(dir!=NULL);
 656
 657                 while (errno=0,(dirent=readdir(dir))) {
 658                         if (!strcmp(dirent->d_name,".") || !strcmp(dirent->d_name,".."))
 659                                 continue;
 660                         g_assert(sandbox_parent_own_orbit_socket==NULL);
 661                         sandbox_parent_own_orbit_socket=g_strdup_printf("%s/%s",sandbox_parent_own_orbit_dir,dirent->d_name);
 662                         }
 663                 g_assert(errno==0);
 664                 errint=closedir(dir);
 665                 g_assert(errint==0);
 666                 g_assert(sandbox_parent_own_orbit_socket!=NULL);
 667                 }
 668
 669         if (child_chroot_pid_hashkey_dir) {
 670 gchar *s;
 671
 672                 child_chroot_parent_own_orbit_dir=captive_printf_alloca("%s/%s",child_chroot_pid_hashkey_dir,sandbox_parent_own_orbit_dir);
 673                 s=(/* de-const */ gchar *)child_chroot_parent_own_orbit_dir;
 674                 do {
 675                         s=strchr(s,'/');
 676                         if (s)
 677                                 *s=0;
 678                         if (*child_chroot_parent_own_orbit_dir) {
 679                                 errint=mkdir(child_chroot_parent_own_orbit_dir,0777);
 680                                 if (errint)
 681                                         g_assert(errno==EEXIST);
 682                                 else {
 683                                         /* chmod(2) it to prevent mode limitation by
 684                                          * active ulimit(2) of being executed by mount(8).
 685                                          */
 686                                         errint=chmod(child_chroot_parent_own_orbit_dir,0777);
 687                                         g_assert(errint==0);
 688                                         }
 689                                 }
 690                         if (s)
 691                                 *s++='/';
 692                         } while (s);
 693                 child_chroot_parent_own_orbit_socket=captive_printf_alloca("%s/%s",
 694                                 child_chroot_pid_hashkey_dir,sandbox_parent_own_orbit_socket);
 695                 errint=link(sandbox_parent_own_orbit_socket,child_chroot_parent_own_orbit_socket);
 696                 g_assert(errint==0);
 697                 /* chmod(2)s also our orig. one (!) but this one is protected by its 0777 directory. */
 698                 errint=chmod(child_chroot_parent_own_orbit_socket,0666);
 699                 g_assert(errint==0);
 700                 }
 701
 702         options_corba.g_log_func=GLogFunc_object;
 703         options_module_captive_to_options_module_corba(&options_corba.filesystem,&CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.filesystem);
 704         /* Prevent secondary captive_giochannel_blind inside of our sandbox child
 705          * as we already have one captive_giochannel_blind in the parent.
 706          */
 707         options_corba.rwmode        =(CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.rwmode == CAPTIVE_OPTION_RWMODE_BLIND ? CAPTIVE_OPTION_RWMODE_RW
 708                         : CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.rwmode);
 709         options_corba.media         =CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.media;
 710         options_corba.debug_messages=CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.debug_messages;
 711         options_corba.image_iochannel=CaptiveIOChannel_object;
 712
 713         load_module_length=g_list_length(CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.load_module);
 714         captive_newn(options_corba.load_module._buffer,load_module_length);
 715         options_corba.load_module._maximum=load_module_length;
 716         options_corba.load_module._length=load_module_length;
 717         options_corba.load_module._release=TRUE;
 718         for (load_moduleui=0,load_module_node=CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.load_module;
 719                         load_module_node;
 720                         load_moduleui++,load_module_node=load_module_node->next) {
 721                 options_module=load_module_node->data;
 722                 options_module_captive_to_options_module_corba(options_corba.load_module._buffer+load_moduleui,options_module);
 723                 }
 724
 725         Captive_Vfs_init(Vfs_object,&options_corba,&captive_corba_ev);
 726         g_assert(validate_CORBA_Environment(&captive_corba_ev));
 727
 728         /* FIXME: Free 'options_corba' - LEAK */
 729
 730         captive_vfs_parent_object->corba_Vfs_object=Vfs_object;
 731         captive_vfs_parent_object->corba_GLogFunc_object=GLogFunc_object;
 732         captive_vfs_parent_object->corba_CaptiveIOChannel_object=CaptiveIOChannel_object;
 733
 734         if (CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.bug_pathname)
 735                 sandbox_parent_bug_doc_make(captive_vfs_parent_object);
 736 }
 737
 738 static void fd_shiftup(int *fdp)
 739 {
 740         g_return_if_fail(fdp!=NULL);
 741
 742         while (*fdp<=2 /* STDERR */) {
 743                 *fdp=dup(*fdp);
 744                 g_assert(*fdp!=-1);
 745                 }
 746 }
 747
 748 void captive_sandbox_fd_closeup(int fd_first_to_delete)
 749 {
 750 DIR *dir;
 751 int errint;
 752 int dir_fd;
 753 struct dirent *dirent;
 754
 755         dir=opendir("/proc/self/fd/");
 756         g_return_if_fail(dir!=NULL);
 757         dir_fd=dirfd(dir);
 758         g_return_if_fail(dir_fd!=-1);
 759
 760         while (errno=0,(dirent=readdir(dir))) {
 761 long dirent_fd;
 762 char *endptr;
 763
 764                 if (0
 765                                 || !strcmp(dirent->d_name,".")
 766                                 || !strcmp(dirent->d_name,".."))
 767                         continue;
 768                 dirent_fd=strtol(dirent->d_name,&endptr,10 /* base */);
 769                 g_assert(dirent_fd>=0 && (!endptr || !*endptr));
 770                 if (dirent_fd<fd_first_to_delete || dirent_fd==dir_fd)
 771                         continue;
 772
 773                 errint=close(dirent_fd);
 774                 g_assert(errint==0);
 775                 errno=0;
 776                 errint=close(dirent_fd);
 777                 g_assert(errint==-1); g_assert(errno==EBADF);
 778                 }
 779         g_return_if_fail(errno==0);     /* check for EOF */
 780
 781         errint=closedir(dir);
 782         g_return_if_fail(errint==0);
 783         errno=0;
 784         close(dir_fd); g_assert(errno==EBADF);  /* just a bit of paranoia; it should be already closed by closedir() */
 785 }
 786
 787 gboolean captive_sandbox_spawn(CaptiveVfsParentObject *captive_vfs_parent_object)
 788 {
 789 /* Vfs_IOR_fds[0] for reading by sandbox_parent() - client,
 790  * Vfs_IOR_fds[1] for writing by sandbox_child()  - server
 791  */
 792 int Vfs_IOR_fds[2],parentheart_fds[2];
 793 int errint;
 794 gboolean errbool;
 795
 796         g_return_val_if_fail(CAPTIVE_VFS_PARENT_IS_OBJECT(captive_vfs_parent_object),FALSE);
 797
 798         errint=pipe(Vfs_IOR_fds);
 799         g_return_val_if_fail(errint==0,FALSE);
 800         errint=pipe(parentheart_fds);
 801         g_return_val_if_fail(errint==0,FALSE);
 802
 803         /* Currently never called anywhere:
 804          *     errbool=corba_shutdown(&captive_corba_ev,&captive_corba_orb,&captive_corba_poa);
 805          *     g_assert(errbool==TRUE);
 806          */
 807
 808         if (CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.sandbox_server_ior) {
 809                 g_assert(CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.sandbox_server_argv==NULL);
 810
 811                 errbool=corba_init("captive-sandbox-parent",&captive_corba_ev,&captive_corba_orb,&captive_corba_poa);
 812                 g_assert(errbool==TRUE);
 813
 814                 captive_vfs_parent_object->corba_parentheart_fds_1=-1;
 815                 captive_vfs_parent_object->corba_child_pid=-1;
 816                 sandbox_parent(
 817                                 CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.sandbox_server_ior,      /* Vfs_IOR */
 818                                 NULL,   /* child_chroot_pid_hashkey_dir */
 819                                 captive_vfs_parent_object);     /* captive_vfs_parent_object */
 820                 return TRUE;
 821                 }
 822
 823         g_assert(CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.sandbox_server_argv!=NULL);
 824         switch ((captive_vfs_parent_object->corba_child_pid=fork())) {
 825                 case -1:        /* error */
 826                         g_return_val_if_reached(FALSE);
 827
 828                 case 0: { /* child */
 829
 830                         errint=close(Vfs_IOR_fds[0]);   /* close Vfs_IOR_fd_read */
 831                         g_return_val_if_fail(errint==0,FALSE);
 832                         errint=close(parentheart_fds[1]);       /* close parentheart_fd_write */
 833                         g_return_val_if_fail(errint==0,FALSE);
 834
 835                         fd_shiftup(Vfs_IOR_fds+1);      /* Vfs_IOR_fd_write */
 836                         fd_shiftup(parentheart_fds+0);  /* parentheart_fd_read */
 837                         errint=dup2(Vfs_IOR_fds[1],1 /* STDOUT */);     /* Vfs_IOR_fd_write */
 838                         g_return_val_if_fail(errint==1 /* STDOUT */,FALSE);
 839                         errint=dup2(parentheart_fds[0],0 /* STDIN */);  /* parentheart_fd_read */
 840                         g_return_val_if_fail(errint==0 /* STDIN */,FALSE);
 841
 842                         captive_sandbox_fd_closeup(2 /* STDERR */ +1);
 843
 844                         execv(CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.sandbox_server_argv[0],
 845                                         /* re-const */ (char * const *)CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.sandbox_server_argv);
 846                         g_return_val_if_reached(FALSE);
 847                         } /* NOTREACHED */
 848
 849                 default: {      /* parent */
 850 gchar *Vfs_IOR;
 851 gchar *child_chroot_pid_hashkey_dir;
 852
 853                         errint=close(Vfs_IOR_fds[1]);   /* close Vfs_IOR_fd_write */
 854                         g_return_val_if_fail(errint==0,FALSE);
 855                         errint=close(parentheart_fds[0]);       /* close parentheart_fd_read */
 856                         g_return_val_if_fail(errint==0,FALSE);
 857                         errint=fcntl(parentheart_fds[1],F_SETFD,FD_CLOEXEC);
 858                         /* This fcntl(2) may not be enough - some fork(2) may duplicate this
 859                          * write descriptor and even if we do some process finish the child
 860                          * may remain alone connected with some unknown fork(2)er from us.
 861                          * Currently I am not aware such case would occur.
 862                          */
 863                         g_return_val_if_fail(errint==0,FALSE);
 864                         captive_vfs_parent_object->corba_parentheart_fds_1=parentheart_fds[1];
 865
 866                         Vfs_IOR=sandbox_parent_read_ior(
 867                                         Vfs_IOR_fds[0], /* Vfs_IOR_fd_read */
 868                                         &child_chroot_pid_hashkey_dir,
 869                                         captive_vfs_parent_object);
 870
 871                         sandbox_parent(
 872                                         Vfs_IOR,        /* Vfs_IOR */
 873                                         child_chroot_pid_hashkey_dir,   /* child_chroot_pid_hashkey_dir */
 874                                         captive_vfs_parent_object);     /* captive_vfs_parent_object */
 875
 876                         g_free(Vfs_IOR);
 877                         g_free(child_chroot_pid_hashkey_dir);
 878
 879                         /* 'parentheart_fds[1]' - parentheart_fd_write - is left open here */
 880                         return TRUE;
 881                         }
 882                 }
 883         /* NOTREACHED */
 884         g_return_val_if_reached(FALSE);
 885 }
 886
 887
 888 GnomeVFSResult captive_sandbox_parent_return_from_CORBA_Environment
 889                 (CORBA_Environment *evp,CaptiveVfsParentObject *captive_vfs_parent_object)
 890 {
 891 GnomeVFSResult r;
 892
 893         if (evp->_major==CORBA_NO_EXCEPTION)
 894                 return GNOME_VFS_OK;
 895
 896         /* If !CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.sandbox_server_argv it is CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.sandbox_server_ior
 897          * where we cannot do any restart anyway.
 898          */
 899         if (captive_vfs_parent_object && CAPTIVE_VFS_OBJECT(captive_vfs_parent_object)->options.sandbox_server_argv
 900                         && (evp->_major==CORBA_SYSTEM_EXCEPTION && !strcmp(ex_CORBA_COMM_FAILURE,CORBA_exception_id(evp)))) {
 901                 r=GNOME_VFS_ERROR_SERVICE_NOT_AVAILABLE;
 902                 if (captive_vfs_parent_object->corba_Vfs_object!=CORBA_OBJECT_NIL)
 903                         captive_vfs_parent_object_aborted(captive_vfs_parent_object);   /* errors ignored */
 904                 }
 905         else if (evp->_major==CORBA_USER_EXCEPTION && !strcmp(ex_Captive_GnomeVFSResultException,CORBA_exception_id(evp))) {
 906                 r=((Captive_GnomeVFSResultException *)CORBA_exception_value(evp))->gnome_vfs_result;
 907                 g_assert(r!=GNOME_VFS_ERROR_SERVICE_NOT_AVAILABLE);     /* code reserved for sandbox restarts */
 908                 }
 909         else {
 910                 r=GNOME_VFS_ERROR_GENERIC;
 911                 g_warning(_("CORBA Exception occured: id=\"%s\", value=%p"),
 912                                 CORBA_exception_id(evp),CORBA_exception_value(evp));
 913                 }
 914         CORBA_exception_free(evp);
 915
 916         return r;
 917 }
 918
 919
 920 void captive_sandbox_child_GnomeVFSResultException_throw(CORBA_Environment *evp,GnomeVFSResult errvfsresult)
 921 {
 922 Captive_GnomeVFSResultException *gnome_vfs_result_exception;
 923
 924         g_return_if_fail(evp!=NULL);
 925
 926         gnome_vfs_result_exception=Captive_GnomeVFSResultException__alloc();
 927         gnome_vfs_result_exception->gnome_vfs_result=errvfsresult;
 928         CORBA_exception_set(evp,CORBA_USER_EXCEPTION,ex_Captive_GnomeVFSResultException,gnome_vfs_result_exception);
 929 }